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Issue 5, 1984
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Solute–solvent interaction effects on tracer diffusion coefficients


Tracer diffusion coefficients (D) for a variety of dipolar and non-dipolar solutes have been measured at normal atmospheric pressure in solutions of acetonitrile, toluene, n-hexane and water at 298.15 K, and in octamethylcyclotetrasiloxane (OMCTS) at 323.15 K. The diffusion coefficients are linearly correlated with the reciprocals of the equivalent hard-sphere diameters (σ) of the solutes for all the solvents except OMCTS, for which ln D is a linear function of 1/σ.

In acetonitrile the dipolar solutes are differentiated from the non-dipolar solutes, whereas in toluene that distinction disappears. In n-hexane the solutes again exhibit two classes of behaviour, but in this case the classes do not correspond to dipolar and non-dipolar solutes. Water as solvent appears to distinguish solutes which can undergo hydrogen-bonding interactions with it from those which cannot. The behaviour of solutes in OMCTS is similar, except that solutes with hydroxylic protons form a separate class from the other solutes.

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Article type: Paper
DOI: 10.1039/F19848001287
Citation: J. Chem. Soc., Faraday Trans. 1, 1984,80, 1287-1295
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    Solute–solvent interaction effects on tracer diffusion coefficients

    A. J. Easteal and L. A. Woolf, J. Chem. Soc., Faraday Trans. 1, 1984, 80, 1287
    DOI: 10.1039/F19848001287

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